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Microsoft Researching Anti-Spam Technique

Microsoft’s Research group are working on a technique to combat spam. Dubbed the Penny Black project, it involves making e-mail senders perform a computation taking around 10 seconds, which their recipients can then check for. This delay would limit bulk e-mailing speeds to around 8000 a day, meaning that to spam all of those fresh, guaranteed 25 million addresses would take approximately 8.5 years